Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61952c650a23665…

MALICIOUS

PDF

141.7 KB Created: 2021-08-22 03:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6bd04b8af30e44aabb0604317384e48c SHA-1: bd49e149bae28ca92412105d733d1e22372dac5e SHA-256: e61952c650a23665cdbead119b61ba9685b30b154576106e64d3048a62ea91e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm or redirection scheme. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.advokat.com/app/webroot/img/fck/file/89651152544.pdf In PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/jsqiu1e6u3670df0vbsibp57bi/16136036562.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/gidure.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fjvcand625tinug7lf72tlivuo/58222739698.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b774d04f1---71202409722.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160884803be5e9---jaliwejejewepuzakujiv.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mpqtvvt4s16uqfbiknk94tp3tu/26430517293.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/sf3ik7rcra9k4u58ac3cj4pm0r/wizivuzi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d24ca8d08---wuzigofatilejuwezuxejipir.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe46dbbf7---60100153633.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c236b961e8862553f7f5ef38b28285f0/15949529113.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b77b68293---kazitoxobejojanewasib.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/sgoi08p636qr7rpmn33139lfa8/mumifosamelavixafude.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/29861343554.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/88777336893.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/29653061805.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/1064203253.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210807110105.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/43658068482.pdfIn PDF document text
    • http://prograsifkalip.com/files/tasadevokuko.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c6e646d17---mezezujunofajikotex.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/40765578820.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/55154450184.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a19a26a502---23228061293.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/ralosoterojidupanovuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=handbook+of+petroleum+refining+processes+4th+edition+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA73 20272 bytes
SHA-256: de35c09e1b3fe0964222a7db702f6a1b56a3cf909393360ad7daf3d84d3ada7e
font_02_sfnt_off00020c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C9B 11556 bytes
SHA-256: df68773abf04584078935f9a91f1e24578faf0a407a1acafcd9dc051fa8851f9